Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddae82e38287a29…

MALICIOUS

PDF

72.2 KB Created: 2021-09-30 23:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2daef3ae707c0332edbbb5f57a30849e SHA-1: 3251cbc22b1c7553fe4f792fa3b6541205656c58 SHA-256: 9ddae82e38287a2999ee6eea26411e8c301e98b19a39325255bce77c19e16bd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites and disposable hosting, designed to redirect users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=how+to+change+someone%27s+name+on+messenger+2021 PDF link annotation
    • http://elektro-galerie-hamburg.de/userfiles/file/60683381583.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/wasugekusenosugemepid.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/gifavu.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/19981213778.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/wafoxe.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ead8749012---66705269164.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314fa3a5203---fitifagivumiba.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/97732565920.pdfIn PDF document text
    • http://12shio5.com/contents/files/volulisunuxuti.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/88569815154.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/20497223854.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/90186463614.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///38809397168.pdfIn PDF document text
    • http://mopron.ru/upload/files/87082073924.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/496e179eccdabfe28b9e4b04a4c5780b/lilix.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2la5ppgd2eshl72hvueql4gfl3/71938975675.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/79985171038.pdfIn PDF document text
    • https://agermag.ro/mm/file/simomudopupuvozenosuzirul.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134f98b81f81---96422697784.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/33083013187.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/xusor.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/92537615726.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210909190821.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/12418220306.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DD 17280 bytes
SHA-256: 33492956aa07a58b77276b3032d9855c90871b0140b116aadc4c5484845385bd
font_01_sfnt_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 10944 bytes
SHA-256: a88727eac596e0d22d57c13fccd0d93954ba945c4113f64c7c039a890a38595d
font_02_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1